261244582660 has 12 divisors (see below), whose sum is σ = 548613623628. Its totient is φ = 104497833056.

The previous prime is 261244582637. The next prime is 261244582661. The reversal of 261244582660 is 66285442162.

It can be written as a sum of positive squares in 2 ways, for example, as 166410148356 + 94834434304 = 407934^2 + 307952^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261244582660.

It is not an unprimeable number, because it can be changed into a prime (261244582661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6531114547 + ... + 6531114586.

It is an arithmetic number, because the mean of its divisors is an integer number (45717801969).

Almost surely, 2^261244582660 is an apocalyptic number.

261244582660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261244582660 is an abundant number, since it is smaller than the sum of its proper divisors (287369040968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261244582660 is a wasteful number, since it uses less digits than its factorization.

261244582660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13062229142 (or 13062229140 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 261244582660 in words is "two hundred sixty-one billion, two hundred forty-four million, five hundred eighty-two thousand, six hundred sixty".